Question about Agaricus Bisporus

Has anyone found Agaricus Bisporus growing in grass? Found some mushrooms today and the best match seems to be Agaricus Bisporus however we found them growing in grass and Roger says "not in grass", there certainly was allot of cow dung about though!

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Re: Question about Agaricus Bisporus

Grassing over manure heaps was where I first encountered bisporus. But I haven't had it from a lawn or anything.

How sure are you that its bisporus? You often find field mushrooms and A. bitorquis misidentified as A. bisporus.